RFR: 8353835: Implement JEP 500: Prepare to Make Final Mean Final

[Alan Bateman]

On Mon, 22 Sep 2025 17:55:22 GMT, Chen Liang <liach at openjdk.org> wrote:

>> I mentioned this in the PR description because it is necessary to change a small number of tests ro run in /othervm mode. This is because jtreg reflectively opening a package isn't sufficient, it has to run the test with `--add-opens`.
>
> Do you think we should update jtreg to fail in the future if `@modules` is specified without othervm, like how `@enablePreview` works today?

No, we need to allow jtreg continue to use its injected JTRegModuleHelper to do this, otherwise it would mean a lot more forking of VMs in test runs for the sake of the tiny number of tests that are hacking finals.

-------------

PR Review Comment: https://git.openjdk.org/jdk/pull/25115#discussion_r2369695722